Unit 63A
Snake River basin agricultural country with scattered buttes and reliable water corridors.
Hunter's Brief
Unit 63A is straightforward terrain—low elevation agricultural land and open flats broken by small buttes and creek drainages. The landscape is heavily networked with roads, canals, and river corridors that provide easy navigation and access from nearby towns like Rigby and Rexburg. Water is consistent throughout the unit via the Snake River system, Spring Creek, and multiple canal networks. Complexity is minimal here; the challenge isn't finding your way around but locating moose in what is otherwise working agricultural country mixed with public hunting ground.
- Compact: under 200 sq mi
- Moderate: 200 - 800 sq mi
- Vast: over 800 sq mi
- Few: under 25%
- Some: 25 - 60%
- Most: over 60%
- Limited: under 0.7 mi/mi² (backcountry)
- Fair: 0.7 - 1.5 mi/mi²
- Connected: over 1.5 mi/mi² (well-roaded)
- Flat: under 20% mountains
- Rolling: 20 - 55%
- Steep: over 55%
- Sparse: under 20%
- Moderate: 20 - 50%
- Dense: over 50%
- Limited: under 0.3% area
- Moderate: 0.3 - 2% area
- Abundant: over 2% area
Terrain Deep Dive
Landmarks & Navigation
The Menan Buttes and Little Buttes serve as key visual landmarks for orientation across the open flats. Market Lake and associated sloughs (Roberts, Oxbow, Butte) mark water concentrations hunters can navigate toward. Spring Creek and the North and South Fork Willow Creek drainages create linear features useful for navigation and access to prime moose habitat.
Tie Bend on the South Fork Snake River offers strategic glassing and movement corridors. The Upper Holmes Lateral and other canal systems crisscross the unit—useful as travel routes but also indicating cultivated land boundaries. These features are straightforward navigation aids in simple terrain.
Elevation & Habitat
Elevation ranges from roughly 4,680 to 5,600 feet, keeping the entire unit in low valley country with minimal relief. Sparse forest and open terrain characterize the landscape, with scattered timber mostly confined to riparian corridors and small knolls. The dominant cover is sagebrush flats and agricultural land, intersected by cottonwood and willow-lined drainages.
Small volcanic features like the Menan Buttes and Little Buttes provide minor topographic breaks but don't fundamentally change the unit's character as relatively open valley floor. Spring Creek and the Snake River system support the most robust vegetation growth, creating travel corridors and thermal cover.
Access & Pressure
Road density is high—over 1,300 miles of road network throughout a moderate-sized unit makes navigation and access straightforward. U.S. 26 and U.S. 191 border the unit, with secondary roads and farm roads providing extensive access to interior areas. Rexburg, Rigby, and nearby towns make staging convenient.
The ease of access and agricultural character mean the unit likely experiences steady hunting pressure, especially along river corridors and near water features. Solitude is unlikely; hunters seeking less-traveled country should plan movements away from obvious water and road corridors. Early-morning and evening hunts targeting riparian cover offer the best chance to avoid other hunters.
Boundaries & Context
Unit 63A sits in the upper Snake River valley of southeastern Idaho, spanning portions of Bonneville, Jefferson, and Madison Counties. The unit is bounded by U.S. 26, U.S. 191, and the Rexburg-Kilgore Road, with the South Fork Snake River forming the northern boundary. It's a compact unit anchored by the Snake River system and includes agricultural lands interspersed with public hunting ground.
Nearby communities—Rigby, Rexburg, and Roberts—provide quick staging points and supply access. The unit encompasses classic valley bottom country where river corridors and irrigated flats dominate the landscape.
Water & Drainages
Water is abundant and reliable throughout 63A. The South Fork Snake River forms the northern boundary and is the unit's dominant water feature, with perennial flow supporting willows and cottonwoods. Spring Creek flows northwest through the unit, providing consistent water and riparian habitat. Multiple smaller creeks—Willow Creek (North and South forks), Birch Creek, and Texas Slough—feed the system.
Market Lake and associated sloughs add water concentration points. An extensive network of irrigation canals (Upper Holmes Lateral, East Canal, Cook-Koster Lateral, and others) crisscrosses the valley. For moose, water is never scarce; the strategy involves finding thermal cover and feed rather than locating water.
Hunting Strategy
Unit 63A is moose country in low, accessible terrain. Moose in this valley bottom unit concentrate in willow and cottonwood riparian areas, particularly along the Snake River, Spring Creek, and smaller creek drainages. The Willow Creek system is prime habitat—both north and south forks offer thermal cover and feed.
Early fall hunting (September) focuses on bull activity near water; rutting behavior becomes pronounced mid-September through early October. Water corridors are predictable travel routes; glassing from butte vantage points (Menan Buttes, Little Buttes) can help locate bulls before moving into thick cover. The flat, open nature of surrounding terrain means moose are relatively confined to drainages—focus effort there rather than chasing open country.